Testing-machine



UNITED STATES PATENT OFFICE.

GEORGE MATHESON, OF MGKEESPORT, PENNSYLVANIA.

TESTING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 225,529, dated March 16, 1880.

Application led March 5, 1879.

To all whom it may concern Be it known that I, GEORGE MArnEsoN, of McKeesport, in the county of Allegheny, State of Pennsylvania, have invented a new and useful Improvement in Hydrostatic Presses for Testing Tubular Articles; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention relates to an improvement in hydrostatic presses for testing tubular articles; and it consists of a sealing-ram arranged in the cylinder of the press, said ram moving over a tubeprovided with a valve and connected with a force-pump or other hydraulic-pressure device and communicating with the interior of the article to be tested, said cylinder of the press being furnished with inlet and outlet valves arranged and operating with relation to the ram and press as will hereinafter more fully appear.

To enable others skilled in the art with which my invention is most nearly connected to make and use it, I will proceed to describe its construction andoperation.

In the accompanying drawings, which form part of my specification, Figure lis a top view of my improvement. Fig. 2 is a side elevation of the same. Fig. 3 is a vertical and longitudinal section of the same.` Fig. 4 is an end view of the same.

In the accompanying drawings, A represents the base of the testing-press, and is furnished with an abutment, B, having a recess, for receiving one end of the tubular article to be tested. On the other end of the base A is arranged the press, consisting of the cylinder C, sealing-ram D, tube e, provided with valves f g, and inlet and outlet valves 7L t'.

The outer end of the sealing-ram is provided with a recess, x', for receiving one end of the tubular article while being tested.

Through the end of the cylinder C, projecting into the interior of it, is a tube, j, which is tted to the bore 7c of the sealing-ram D. The tube j is provided with two valves, f g, the valve g being connected to a. pipe communieating with a force-pump or other hydraulic pressure on the interior of the pipe being tested.

The valve h is for the supply of water or other iiuid to the chamber, land the valve -i is an overflow-valve, which, by suitable gage, determines the amount of the pressure of the sealing-ram D on the end of the pipe being tested. The valve h is connected to a force-pump or other hydraulic pressure.

\ 'Ihe skilled mechanic will readily understand the construction and arrangement of the several parts hereinbefore described and the relation they bear to each other. Therefore, without further description as to their construction, I will proceed to describe the operation, Which is as follows:

One end ofthe pipe m to be tested is placed in the recess of the abutment B, and the other end in the recess w in the end of the sealing-ram D, as shown in Fig. 3. The valve h is opened, and water Hows into the chamber l, whichV forces the sealing ram D outward against the end of the pipe m, which forces the other end against the abutment B, thereby sealing up the two ends of the pipe.

To adapt the press to tubes or pipes of different diameters, the cylinder is provided with an overflow-valve having any of the known adjusting-gages-for example, the lever and weight, such as is usually applied to the safetyvalves of steam-boilers. This gage is set so that only a given pressure of the sealing-ram can be brought on the ends of the tube or pipe to be tested. The greater the diameter of the pipe the greater will be the pressure required by the ram to sealrit. The tube or pipe m being properly sealed by the ram D pressing against it, the operator `opens the valve g, which will allow water to viiow through the tube j and bore 7c of the ram D into the pipe m, lling it, when the desired pressure -is brought upon the interior of the pipe fm, which may be indicated by a mercury-gage or other device connected to the valve f, which opens and allows the water to overflow, thereby preventing any undue pressure upon the interior of the pipe m.

It will be observed that by the construction and arrangement of the several parts constituting the testing-press hereinbefore described the pressure of water in the chamber l moves the ram D, which seals the ends of the pipe m, and the water from the force-pump or other hydraulic pressure communicates with the interior of the pipe through the medium of the tube j and bore k of the ram D, thereby applying to the pipe m two separate pressuresthe pressure of the ram D for sealing up the ends of the pipe m, and the pressure of the force-pump or hydraulic pressure for testing the pipe, and each pressure being regulated by valves and gages.

Having thus described my improvement, what I claim is- 1. A hydrostatic press for testing tubular articles, consisting of cylinder C, ram D, having bore la, and tube j, substantially as herein described, and for the purpose set forth.

2. In ahydrostatic press for testing tubular articles, the cylinder C, provided With inlet and outlet valves, ram D, having bore k, and tube j, substantially as herein described, and for the purpose set forth.

3. In a hydrostatic press for testing tubular articles, the ram D, provided with a bore, 7c, in combination with an abutment for sealing the ends of the pipe to be tested, substantially as herein described.

GEO. MATHESON.

Witnesses:

A. C. J oHNs'roN, D. C. ALLEN. 

